H5_0047：localStorage本地浏览器数据存储

1，localStorage 存储数据支持5M大小，只有不清除历史记录，数据就在

            var data = {
                left: 0,
                top: 0,
                scale: 1,
                rotate: 0
            };
            // localStorage本地存储
            window.localStorage.cat_touchjs_data = JSON.stringify(data);
            // localStorage本地读取
            console.log(localStorage.cat_touchjs_data.left);